... Joey's mangled version of "basement" in I Don't Wanna Go Down To The Basement by the Ramones. He manages to contract it into about half a syllable and if it wasn't for the title I think it would be pretty much impossible to work out what he's signing:

The whole album. In fact the whole Cocteau Twins catalogue up to that point. Pearly dew drops drops is particulary good because you can make out the titular lyrics and interpret the rest as you please.
After that Liz Fraser seemed to want to be intelligible. Maybe not on Teardrop, have to listen to that again when I get home